SPL and Distortion Measurements of Bluetooth Speaker

Simon Curran · Dec 14, 2018

First: This is beautiful & powerful piece of software that I'm very happy to support and encourage others to donate!

I have a Bluetooth speaker that I'm trying to create and have some questions:
1) Do the SPL and distortion measurements work when the audio output is via a Bluetooth signal?
2) I think there is a very minor delay via the Bluetooth signal, so during the frequency sweep, does the software assume the signal it is sensing via the mic is at a certain frequency (zero delay) or does it truly isolate the frequency from the microphone data?
3) What should I be careful of doing tests via Bluetooth?

Sincerely,
Simon

John Mulcahy · Dec 14, 2018

Yes, all should work as normal. The main potential issue is overall latency, if that is getting into seconds then best using the acoustic timing reference option and check the "Wait for timing reference" box on the Measure dialog. Delays are compensated for while calculating the response.

Simon Curran · Dec 14, 2018

That's great. Thank you.

Matthew J Poes · Dec 15, 2018

I've actually had some problems trying to do measurements of bluetoothdevices over bluetooth. Certainly give it a shot, you neve know. If it doesn't work, you can expert a sine sweep recording and record it out of the device, then import it into REW to create the measurement. That worked fine for me. When I measure headphones over bluetooth, that is what I have to do to get it to work right.

SPL and Distortion Measurements of Bluetooth Speaker

Simon Curran

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John Mulcahy

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Simon Curran

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Matthew J Poes

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